Description
The CD40208BMS is a 4 x 4 multiport register containing four 4-bit registers, write address decoder, two separate read address decoders, and two 3-state output buses.

Features
• High Voltage Types (20V Rating)
• One Input and Two Output Buses
• Unlimited Expansion in Bit and Word Directions
• Data Lines have Latched Inputs
• 3-State Outputs
• Separate Control of Each Bus, Allowing Simultaneous Independent Reading of any of Four Registers on Bus A and Bus B and Independent Writing Into any of the Four Registers
• 100% Tested for Quiescent Current at 20V
• Standardized, Symmetrical Output Characteristics
• 5V, 10V and 15V Parametric Ratings
• Maximum Input Current of 1µA at 18V Over Full Package-Temperature Range; 100nA at 18V and +25°C
• Noise Margin (Full Package-Temperature Range):
    - 1V at VDD = 5V
    - 2V at VDD = 10V
    - 2.5V at VDD = 15V
• Meets All Requirements of JEDEC Tentative Standards No. 13B, “Standard Specifications for Description of “B” Series CMOS Devices”

Applications
• Scratch Pad Memories
• Arithmetic Units
• Data Storage